Não informado. (1969). Today's education. National Education Association.
Chicago-referens (17:e uppl.)Não informado. Today's Education. Washington: National Education Association, 1969.
MLA-referens (8:e uppl.)Não informado. Today's Education. National Education Association, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.